Pump



Jan. 71 1936.

J. P. JOHNSON PUMP Filed April 8, 19:3

' 2 Sheets-Sheet 1 Mrs-me: JvMssfifmwsval Y J Arroewers Jan. 71, 1936, I J. PzJOHNSON 2,026,739

Filed April 8, 12:5 2 Sheets-Sheet 2' Patented 7, 1936 UNITED vs'm'rias PATENT OFFICE I 1 Claims. (01.103431) The present invention relates to rotary pumps or motors and has for its primary object to provide such a device which. is simple in construction, efllcient in operation and inexpensive to.

manufacture.

A further object of the invention is to provide the rotor of the pump or motor with one or more ,slidable blades, removable and replaceable in the' event of injury or excessive wear, and so formed as to distribute the wear substantially equally over the entire engageable surfaces.

A further object of the invention resides in providing a bearing roller, secured or freely rotatable as may be desiredywith which the inner l5 ends of the slidable blades engage, and which i is replaceable by a 'roller'of larger diameter in the event of wear upon the slidable blade or blades so as to maintain a running fit betweenthe outer end of each blade and the adjacent engageable surface of the pump housing.

A further object of the invention is to provide a pump or motor of the type referred to in which adjustment may be made to vary the capacity thereof.

25 With the objects above indicated and other ob jects hereinafter explained in view the invention consists in the construction and combination of 4 elements hereinafter described and claimed.

Referring to the drawings:

"' Figure 1 is an end elevational view of a pump or motor embodying one form of the present invention;

Fig. 2 is a longitudinal vertical lsectionaljview taken on line 2-2 of, Fig. 1; Fig. 3 is an end elevational view of a pump embodying a modification of the invention; a Fig. 4 is a longitudinal vertical sectionalvie taken on line 44 of Fig. 3;

Fig. 5 is a longitudinal vertical sectional-view of -a pump embodying a further modification of .the invention;

Fig. 6 is a transversesectional view taken on line G6 of Fig. 5; v v f o Fig. 7 is a transverse sectional view taken on line 1-1 of Fig.8 and showing one form of blade and mounting therefor;

Fig. 8 is a longitudinal vertical sectional view of the arrangement shown in Fig. '7;

, Fig. 9 is a transverse sectional view taken on line 9-9 of Fig. 10 and showing a modified'form of blade and mounting therefor;

Fig. 10 is a longitudinal vertical sectional view of the arrangement shown in Fig. 9;

Fig. 11 is a transverse sectional view taken on line ll-H of Fig. 12 and showing a further mod-.

,ifled form of blade and mounting therefor, and

Fig. 12 is a longitudinal vertical sectional view of the arrangement shown in Fig. 11.

In the drawings severalconstructions are illustrated all embodying the present invention, 5 but each being particularly adaptable for use in various connections, as will be later described.

In Figs. 1 and 2 of the drawings an adjustable metering pump is shown which consists of a housing generally indicated by the numeral 20. 10 This housing has a rear portion 2| provided with a laterally extending annular flange 22 of any desired diameter. A substantially rectangular plate 23 has one of its sides engageable with the adjacent side of the flange 22, while its opposite side is engageable with the inner adjacent side of a cap 24 which may be circular, as shown, and of a diameter preferably the same as the diameter of the flange 22, the said cap and flange members being coaxially assembled. Dowel pins 25 are preferably mounted upon the flange member 22 and extend outwardly through aligned openings 26 provided in the cap 24 and elongated openings 26' in the member 23, as more clearly shown in Fig. 1, to definitely position the cap 24 25 with respect to the flange 22. The flange 22, member 23 and cap 24 are maintained in assembled relation by means of bolts 21 extending through aligned openings in the members and having screw threaded engagement with the 30 flange 22, as indicated at 28. The openings 29 in the member 23 through which the bolts 21 extend are elongated in a vertical plane, as shown in the views referred to, to permit the member 23 to be vertically adjusted with respect to the I flange 22 andcap 24 for a purpose to be later described. a

The member 2| is provided with an axial bore '30 to rotatably receive therein a shaft 3| having enlarged bearing portions 32 spaced apart and 40 engageable with theinner surface of the bore 30.

Concentric with the bore 30 is a counterbore 33 provided upon the inner side of the cap 24 which rotatably-receives an enlarged bearing portion 34' provided upon the outer end of the shaft 32. 46

of the is 'aft i'i'l. The peripheral surface of the rotor 35 is normally in running engagement with the upper inner s iirfaceof. the chamber at a point'indicated' by 31in Fig. 1, and which point of running engagement is normally located between the inlet and outlet passageways, as will be later referred to. The outer end of the shaft 3| adjacent the bearing portion 34 is provided with a bore 38 concentric with the axis of the shaft 3| and extends inwardly beyond the inner end of the rotor 35.

The rotor 35 has a plurality of longitudinally extending slots 39 placed circumferentially thereof and extending in a plane passing through the axis of the shaft 3|. These slots 39 extend entirely through the rotor 35 to the bore 38. A. plurality of blades 40, of which four are herein illustrated, are slidably mounted within the slot 39 of the'rotnr 35 and have arouate outer surfaces en ageable with the inner periphe al surface of the chamber provided by the op ning 36. These blades 48 extend inwardly within the bore 36 and have arcuate ends eng geable with a roller member 4| disposed longitudinally within the bore 38. as more clearly shown in Fi 2. This roller member 4| has its axis substantially concentric with the axis of the opening 36 in the member 23. but eccentric with respect tothe axis of the shaft 3| and normally tends to maintain the outer ends of. the blades 40 in enga ement with the inner peripheral surface of the chamber. The depth of the blades 48 is substantial y the-same as the depth of the rotor 35 and both are adapted to engage the inner adjacent surface of the flan e 22 end the cap 24 to provide a substantially fluid-tight joint.

An inlet recess 42 and an outlet recess 43 are disposed, respectively, upon opposite sides of the chamber and are in communication therewith with the engaging portion 31 between the rotoi and chamber disposed therebetween. These re 'cesses are-provided in the member 23 and are of a lesser depth than the depth of the rotor 35, as clearly shown in Fig. 2. It will also be noted that the extremities of the recesses 42 and 43 extend to substantially'a distance corresponding to the distance between the outer edges of ad- .iacent blades 40. An opening 44 is provided in the member 23 and communic tes at its up er end with the recess 42, thus providing a flu d inlet passageway. while a similar open ng 45 is provided in the member 23 havin its upper end communicating with the recess 43, thus providing a fluit outlet passageway. The openings 44 and 45 extend downwardly to the lower end of the member 23 and ere interiorly screw threaded to receive screw threaded plugs 46 for sealing the ends of the open ngs. The lower end of the member 23 is provided with a transverse opening 41 to receive the body portion of a headed member 48. body portion of the headed member 48 is engageable with one side of the member 23 and is secured in place by a screw threaded nut 49 .en gageable with the screw threaded end of the headed member 48. The headed member 48 is provided with an opening 50 communicating with the inlet opening 44 and an opening communicating with the'outlet opening 45. These openings 5| and 45 may be connected with fluid inlet and outlet means, notshown.

If the device is .to be used as a fluid pump an external gear 52 has a hub portion 53 rotatably mounted upon a reduced end 54 of the member 2| and is connected by means 01 a washer 55 The offset between the head and' which results in increasing or diminishing the clearance at the point 31 between the rotor and inner peripheral surface of the chamber. Likewise, the operation of the pump may be reversed by adjusting the plate 23 so as to position the axis of the chamber upon the opposite side of the axis of the shaft 3| from that shown in the figures. The adjustment of the plate may be accomplished by loosening the bolts 21 so as to unclamp the plate 23 and, after the latter has been adjusted to its desired position, the same, may be reclamped by tightening the bolts 21. The adjustability of the plate is permitted by reason of the elongated openings 29 provided in the plate 23. With this type of pump it is possible to adjust the pump to the desired capacity by means of a micrometer placed about the outer side of the flange 22 and the outer side of the headed member 48.

In Figures 3 and 4 a slightly different construction of a pump embodying the invention is disclosed, it being possible,-however, to similarly adjust the pump to obtain any desired capacity. Furthermore, in this construction it will be noted that the rotor is not supported uponits opposite sides, as is the construction of the pump disclosed in Figs. 1 and 2. This pump has a base 60 and.

force the latter. A shaft 65 is rotatably mounted within the bore 63 and has a reduced screw threaded extension 66 provided upon one end. At the opposite end the shaft 65 is provided with an integral rotor 61 concentric with the axis of the shaft 65 and of somewhat larger diameter. A member 68 is positioned upon the outerside of the upright portion 6|, while a cap 69 engages the opposite side of the member 68, as clearly shown in Fig. 4. This cap 69 is secured to the member 68 by means of bolts 10, while the membars 68 and 69 are secured to the upright portion 6| by means of a plurality .of bolts H having screw threaded engagement with openings 12 provided in the upright portion 6|. Thealigned openings 13 provided in the members 68 and 69, through which the bolts I I, extend, are elongated in a vertical direction, as viewed in the figures, so that the member 68 may be adjusted with respect to the axis of the shaft 65. The member 68 is provided with a transversely extending opening 14 forming a fluid chamber, the axis of which is eccentric with respect to the axis of the shaft 65. The rotor 61 is adapted to have running engagementwith the inner peripheral surface of the chamber at a point indicated by 15, but, of course, the distance between the rotor and the peripheral portion of the chamber may be varied depending upon the desired capacity of the pump.

The end of the shaft 65 adjacent the rotor has an axial bore 19 extending inwardly slightly beyond the end of the rotor, while the rotor is provided with a plurality of slots 11, extending in-- wardly to the'bore l9; There are four of these slots illustrated and extend in planes passing through the axis of the shaft 55. A plurality of blades 18 are slidably mounted within the slots 11 and have arcuate outer ends engageable with .the inner peripheral surface of the chamber or the roller, member 4I shown in Figs. 1 and 2, in

that it is a resilient split tube adapted to exert an outward force upon the ends of the slidable blades 10 to maintain the latter in engagement with the inner peripheral surface of the chamber. The roller member is diagonally severed, as shown at 80, so as to prevent engagement of the inner ends of the blades with the entire length of the slot at any one position.

The upper end of the member 08 is provided with an opening 9| within which is disposed one end of a threaded stud 02. The endof the stud is secured within the member 08 by means of a pin 83 disposed in aligned'transverse' openings in the member 98 and the stud 82, respectively. The threaded end of thestud 82 extends through an openingll'provided in a lateral extension 85 ,formed integral with the upright portion 9|. An

adjusting nut 09 is mounted upon the. screw threaded end of the stud 82 and engages the under surface of the lateral extension, while a locking nut 81 is mounted upon the outer end ,of the stud and engages the outer side of the lateral extension to secure the member 58 in any desired adjusted position. The member 68 may be adjusted by loosening the bolts II, the nut 81, and turning the nut 99 inthe desired direction so as to raise or lower the member 09 thereby changing the relationship of the axis of the rotor with respect to the axisof the fluid chamber.

An inlet recess 08 and an outlet recess 99 are provided in the member 98 upon the opposite sides of the fluid chamber with the contact point 15 therebetween. An inlet openingis provided in the member 08 and communicates with the recess 99 to provide a fluid inlet passageway, while an opening 9I is provided upon the opposite side of the member 00 and communicates with the recess 89 to provide a fluid outlet passage- 98.

, In Figs. 5 and 6 a still different type of pump construction is illustrated, but embodying the same invention. This pump is particularly designed as a fluid pump foruse in connection with aircrafts. The construction is compact and the operation very efficient. The diameter of the fluid chamber can be kept relatively small for a given capacity thereby keeping the surface speed of the rotor to a minimum. which insures against seizurecoming while within the requirements of a dry, run test where the temperature cannot ex-, ceed a predetermined degree. The weight of the slidable blades is likewise maintained at a minivmum and, due to centrifugal force under high speed, effects an efficient sealing between the outthe blades and the inner peripheral er ends of surface of the fluid chamber. This pump is reversible and can also be used-as a driving means ,I09 is interiorly screw threaded at having an axial bore 99 provided therein. A bushing 94 is disposed within the bore 93 and abuts the closed end of the housing 92, as clearly shown in Fig. 5. A bushing is also disposed within the bore 93 and in spaced relation with respect to the bushing 94 a member 99 is disposed within the bore 93 between the bushings 94 and 95 and is prevented from rotation with respect to the housing by means of a' pin 91 secured in the housing and disposed within a lon- 1 gitudinally extending groove 98 upon the upper portion of the member 96. This member 95 has a transversely extending circular opening 99, the axis of which is eccentric with respect to the axis of the bore 93 and provides a fluid chamber. A 15 shaft I00 extends axially of the housing and has enlarged bearing portions IOI spaced apart and rotatabiy supported within aligned openings I 02 provided in the adjacent ends of the bushings 94 and 95. Theshaft I00 has an integral 20 I rotor I03 0f enlarged diameter extending between the bearing portions I0l, the axis of which is concentric with the axis of the shaft I00, but eccentric with respect to the axis of the chamber.

r pheral surface of the chamber at a'point indicated by I04 and an axial bore I05 extends outwardly beyond the outer end of the rotor. The rotor I03 is further provided with a plurality of longitudinally extending slots I06 :3 extending from the outer periphery thereof into the bore I05. Theseslots I06 extend in planes which pass through the axis of the rotor and haveblades I01 slidably mounted therein. The

outer ends of the blades are arcuate and engage 5 the inner peripheral surface of the. chamber and likewise the inner ends of the blades are arcuate and engage with a roller'member I09 disposed within the bore I05. The axis of the roller member I08 is eccentric with respect-to the axis of the rotor and tends to maintain the outer ends of the blades in engagement with the inner pewhich the shaft I00 extends and around the shaft is a cork gasket III adapted to prevent the 5 escapement of fluid along the --shaft., Theplug itsTorwarcL end to receive a screw threaded plug III, the inner end of which engages the cork gasket III and tends to compress the same into fluid-tight engagement with the shaft I00. The plugs I09 and 2 have aligned openings H9 which communicate at one end withthe shaft I00 and at the opposite end with an opening II4 to which a suction tube may be'connected for :the purc9 pose of determining whether there is any leakage of fluid along the shaft. I00 past the cork gasket l I I. a

Openings -I I5 are provided in the member 98 upon opposite sides of the-chamber and communig5 caterespectively with a fluid inlet opening H9 and afiuid outlet openfng' I" provided in the housing 92. I w I I It will'be seen that with this construction the bushings 94 and 95 may be replaced in the event 7o 7 of excessive wear and, likewise; 'the member 99 may be removed from the bore of the housing and replaced in caseof wear or other accident. f Likewise, in all of the constructions, so far described,

theblades are reversible as well asinterchange 75 The rotor I03 i normally adapted to en- 5, gage the innerpel peripheral surface of the chamber.

In Figs. 7 to 12, inclusive, more or less diagrammatic arrangements 'are disclosed to particularly illustrate the construction and arrangement of various types of blades which may be employed in connection with the pumps, heretofore described. In Figs. 7 and 8 the housing ofthe pump isindicated by II 8 and has a circular opening II9 therein to provide a fluid chamber. A rotor I20 is disposed within the fluid chamber and is providedwith an integral rearwardly extending shaft I2I which is mounted in a suitable bearing I22 for rotation about an axis eccentric with respect to the axis of the chamber or opening II9. An axial bore I23 is provided-in the rotor I20 upon the side opposite to the shaft MI. The rotor I20 is also provided with a plurality of longitudinally extending slots I24 extending through the rotor to the bore I23.

The axis of the rotor is so positioned with respect to the axis of the chamber or opening I I9 that a'running engagement is provided at a point I25 between the outer peripheral surface of the rotor I20 and the inner peripheral surface of the chamber II9. Furthermore, a fluid inlet opening I26 is provided in the housing and communicates with the chamber H9, while an outlet opening IZ'I isalso provided in the housing and communicates with the chamber 9. "The outlet opening may be provided with a spring pressed valve I28 to ofiera resistance to the passage of fluid therethrough. The inlet and outlet openingsare normally positioned upon opposite sides of the point of engagement I25 when rotation of the rotor are is in the direction indicated by the arrow in- Fig. 7. A plurality of blades I29 are slidably mounted within the slots I24 and engaging at their outer ends with the inner peripheral surface of the chamber 3,

while their inner ends are in engagement with a loosely mounted roller I30 disposed within the bore I23 with the ams of the roller member concentric with respect to the axis of the chamber H9, but eccentric with respect to the ans of the rotor I20.

In this particular construction the opposite ends of the blades I29 are of arcuate curvature and have a commonradius I3I struck from a point within the blade structure located 'in a plane I32 passing through the points of engagement between the outer ends of the blades and the inner peripheral surface of the chamber, the inner ends of the blades and the outer peripheral surface of the rotor member, and the axis of the rotor member. By providing this relationship it is possible to distribute the wear upon the ends of the blades substantially throughout the entire surface area.

Figs. 9 and 10 illustrate a further modification of the rotor and blade structure in which the pump consists 01 a housing I 33 having a circularopening I34 therein providing a fluid chamber. The housing has a fluid inlet opening I35 and a fluid outlet opening I 36 communicating with the chamber I-34 in a manner explained in connection with Fig. '7. A rotor I 3'! is disposed within,

the chamber I34 and has an integral shaft I38 at one side thereof which is'rotatably mounted in bearings I33, the axis of which is eccentric providing a fluid chamber.

with respect to the chamber I 34. The rotor I3! is provided with an axial bore I40 on the side opposite to the shaft I38 and also has a longitudinally extending slot I 4| extending through the rotor to the bore I40. A blade I42 is slidably mounted within the slot' MI andhas its outer end engageable with the inner peripheral surface of the chamber I34 while the inner end is engageable with a roller member I43 disposed within the bore I40 with its axis concentric with respect to the axis of the chamber I34, but eccentric with respect to the axis of the shaft I38.

Where a single blade-is employed, as shown in this construction, the roller member. I43 must be secured against movement with respect to its axis and consequently the roller member is provided with an extension I44 secured within an adjacent portion of the housing. The outer end'of the blade contacts throughout its entire length with the inner peripheral surface of the chamber I34, but the inner end of the blade is cut away at I45 for purpose of clearance, the inner engaging end of the blade, however, engaging throughout its entire length and so far as its engagement with the roller member I43 is concerned. 26 In the biadeillustrated in Fig. 9 the opposite ends of the blade I 42 are arcuate, but are struck with difieren't radii from a common center, the outer surface being arcuate and struck from a radius I46, while the inner end is struck from a diiferent radius I43, but from the same center. The common center lies in a plane passing through the point of engagementbetween the outer end of the blade and the inner peripheral surface of the chamber I34, the inner engaging surface of the blade, and the outer peripheral surface of the roller member I43 and the axis of the roller member. The purpose here again is to distribute the wear equally over the entire contacting surface.

In Figs. 11 and 12 a still further construction is illustrated in which a pump consists of a housing I48 having its circular opening I49 therein An inlet opening I50 and an outlet opening I5I are also provided in the housing and communicate with the chamber 40 I43. A rotor I52 is disposed within the chamber I43 and has an integral shaft I53 rotatably mounted in bearings I54 about an axis eccentric with respect to the axis of the chamber I49. The

in the end opposite-to the shaft I53 and also is provided with a longitudinally extending slot I58 extending through the rotor to the bore I55. A blade I511 is slidably mounted within the slot I 56 and has its outerend in engagement with the inner peripheral surface of the chamber I49. The inner end of the blade .is provided with laterally extending spaced lugs I 58 which receive therebetween the free end of. an arm I59 formed integral with a sleeve I60. The sleeve is loosely 60 mounted upon the inner end of a pin I60 having its opposite end secured in an adjacent portion of the housing. The lugs I58 and the adjacent end of the arm I 59 are provided with aligned openings through which extends a bushing ISI. At the opposite ends of the lugs I58 circular washers I62 are provided and a pin I63 extends through aligned openings in the washer, and bushing and have their opposite ends riveted or otherwise secured so as to maintain the member in assembled relation.

' In this particular construction the outer end of the bladeis arcuate andis struck from a radius .184, the center of which is common with the axis of the pin I63. This common center or axis lies in a plane passing through the point of engagement between the outer surface of the blade and the inner peripheral surface of the chamber I49 and the axis of the pin I80.

' of the rotors, the outer ends of the slidable blades are maintained in engagement with the inner peripheral surface of the chamber by reason of the roller member which engages with the inner ends of the blades. As the blades pass the fluid inletopening a suction is created drawing the fluid into one of the spaces between the adiacent blades as thecapacity increases and then the fluid is forced towards the outlet opening,

while at the same time being compressed so that it is ultimately ejected through the outlet opening at considerable pressure. In employing four blades it has been found that the pump discharges substantially evenly without any indication of pulsations. The device, of course, may be used as a pump, or may be used as a pump or a motor as may be desired.

While I have described the preferred embodiment of the invention it is to be understood that I am not to be limited thereto, inasmuch as changes and modifications may be resorted to without departing from thespirit of the invention as defined in the appended claims.

Having thus described my invention, I claim: 1. A rotary pump comprising a housing having an axial bore therein closed at one end and provided with fluid inlet and outlet openings, a bushing mounted in said bore adjacent the closed end and having an axial opening therethrough, a

second bushing mounted in said bore in spaced relation with respect to said first-mentioned bushing and having an axial opening therein, a

liner mounted in said bore between saidbushings and having a circular opening extending therethrough, the axis. thereof being offset but parallel with respect to the axis of said bushing openings, said liner having openings connecting the circular opening thereof with the fluid inlet and outlet openings, a rotor positioned in said' circular opening and having extensions rotatably mounted in the bushing openings, said rotor having an axial bore extending inwardly from theclosed end of said housing and having a running engagement with the inner periphery of said liner between the fluid inlet and outlet openings, said rotor having longitudinal'slots extending through the wall thereof in spaced, angular relation, blades slidably mounted in said slots and having their outer ends engageable with the inner periphery of said liner, a roller member positioned in the bore of said rotor and engageable with the inner ends of said blades for normally maintaining the latter in predetermined relation, a shaft connected, to the closed ingan axial boretherein closed at one end and 1 end of said rotor and extending outwardlyax- 1 ially thereof beyond said housing, and detachable means closing the openend of said housing. Y 2. A rotary pump comprising a housing havprovided with fluid inlet and outlet openings, a

bushing mounted in said bore adjacent the closed end and having an axial opening therethrough,

a second bushing mounted in said in sp'aced relation with respect to said first-mentioned bushing and having an axial opening therein;

a liner mounted in said bore between said bushings and having a circular opening extending 5 therethrough,. the axis thereof being. oflset but parallel with respect tothe axis of said bushing openings, said liner having openings connecting the circular opening thereof with the fluid inlet "andoutlet openings, a rotor positioned in said a circular opening and having extensions rotatably mounted in the bushing openings, said rotor having an axial bore extending inwardly from the closed end of said housing and having a running engagement with the inner periphery of said liner between the fluid inlet and-outlet openings, said rotor having longitudinal slots extending through the wall thereof in spaced. angular relation, blades slidably' mounted in said slots and having.

their outer ends engageable with the inner'pe-go riphery ofsaid liner, a roller member positioned in the-bore of said rotor and engageable with the inner ends of said blades for normally maintaining the latter in predetermined relation, a

shaft connected to the closed end of said rotor and extending outwardly axially thereof beyond said housing, a plug removably mounted in the open end of said housing and having its inner end abutting the adiacent'end of said secondmentioned bushing, said plug having an axial opening encircling said shaft, a packing member surrounding said shaft and disposed within said plug opening adjacent said second mentioned bushing, and a member removably mounted in said plug opening for maintaining said packing in place.

3. A rotary pump comprising a housing having an axial bore therein closed at one end and provided with fluid inlet and outlet openings, a bushing mounted in said bore adjacent the closed 0 end and having an axial opening therethrough,

a second bushing mounted in said bore in spaced relation with respect to said first-mentioned bushing and having an axial opening therein, a liner mounted in said bore between said bushings and having a circular opening extending therethrough the axis thereof being offset but parallel with respect to the axis of said bushing openings, said liner having openings connecting the circular opening thereof with the fluid inlet and mutlet openings, means for securing said liner against rotative movement within said'bore,

a rotor positioned in said circular opening and having extensions rotatably mounted in the bushing openings, said rotor having an axial bore V extending inwardly from the closedend of said housing and having a running engagement with the inner periphery of said liner between the fluid inlet and outlet openings, said rotor having longitudinal slots extending through the wall thereof in spaced angular relation, blades. slidably mounted in said slots and having their outer ends engageable with the inner periphery of said liner, aroller member positioned inthe bore of said rotor and engageable with the inner ends of said blades, for normally maintaining the latter inpredetermined relation, a shaft connected to the closed end of said rotor and extending outwardly' axially thereofbeycnd said housing, and

detachable means closing the open end of said housing. r

4. A rotary pump comprising a housing having an axial bore thereinand fluid inlet and outlet peways, members mounted in said bore andspaeed to provide a circular chamber 15 through the-open end of said extension and extending substantially throughoutthe length of communicating with said. passageways, the axis of said c rcular chamber being effect but parallel with respert to the-axis of said bore,-a cylindrical chamber and having its axis coaxial with the axis of said axial bore so as to provide a running engagement between said rotor and the inner periphery of said chamber between said fluid inlet and outlet passageways, integral reduced axial extensions on the opposite ends of said rotor rotatably journalled'in the adjacent members, an axial shaft integrally connected to one of said extensions and projecting outwardly beyond said housing, said rotor and other extension having an axial bore of'lesser diameter than said extension and terminating in said extension to which said shaft is connected, longitudinal slotsv'spaced'angularly extending through the wall of said rotor into communication with the 'bore thereof, blades slidably mounted in said slots and having their outer ends adapted for running engagement with the inner periphery oi said chamber, anda roller member insertable said bore, said roller member being adapted for engagement withthe inner ends of said blades for maintaining the latter in predetermined spaced relation and having a rolling contact therewith.

5. A rotary pump comprising a housing having an axial bore therein and'fluid inlet andoutlet passageways, members mounted in said bore and spaced apart to provide acircular chamber,

a liner secured in said chamber between said members. and having an axial bore the axis of which is ofiset but parallel with; the axis oi said 'chambensaid liner having openings communieating with said fluid inlet and outlet passageways, a cylindrical rotor disposed in said liner and extending from member to member, said rotor being ofsmaller diameter than the diameter of said chamber and having its axis coaxial with the axis of said axial bore so as to provide a running engagement between said rotor and the inner periphery of said chamber between said fluid inlet and outlet passageways, integral reduced axial extensions on the opposite ends of said rotor rotatably journalled in the adjacent members, an axial shaft integrally connected to one of said extensions and projecting outwardly beyond said housing, said rotor and other extension having an axial bore of lesser diameter than said extension and terminating in said extension to which said shaft is. connected, longitudinal slots spaced angularly extending through the wall of saidrotor into communication with the bore thereof, blades slidably mounted in said slots and having their outer ends adapted for aoaarac I for maintaining the latter in predetermined spacedrelatlon and having a rolling contact,

therewith.

6. A rotary pump comprising a housing hav- 10. ing anaxial bore therein closed at one end and provided with fluid inlet and outlet openings, a bushing mounted in said bore adjacent the closed end and having an axial opening therethrough, a second bushing mounted in said bore in spaced relation with respect to said first-mentioned bushing andhaving an axial opening therein,a

liner mounted'in said bore between said bushings and having a circular opening extending therethrough, the axis thereof being ofiset but parallel with respect to the axis of said bushing opensaid liner, having openings connecting the circular opening thereof with the fluid inlet and outlet openings, a rotor positioned in said circular opening and having extensions rotatably mounted in the bushing openings, said rotor having an axial opening and a running engagevmet with the inner periphery of said liner between the fluid inlet and outlet openings, said rotor having longitudinal slots extending through the wall thereof in spaced, angular relation, bladesslidably mounted in said slots and having their outer ends engageable with the inner periphery of-said liner, a roller member positioned in said axial opening of said rotor and engageable with the inner ends of saidblades for normally maintaining the latter in predetermined relation, a shaftconnected tosaid rotor and extending outwardly axially thereof beyond the open end of said housing, and detachable means closing the open end of said housing.

7. A rotary pump comprising a housing having a circular chamber therein, a rotor eccentrically positioned within said chamber and rotat ably mounted in said housing, said rotor having an axial bore therein, a blade slida-bly mounted in said rotor and having its outer end engageable with the inner peripheral wall of said chamber, .and an elongated roller member disposed within said bore and engageable with the inner end of said blade to maintain the latter in predetermined position, said blade having arcuate opposite ends of different radii struck from a common center which lies in a, plane passing through the points of engagement between the outer end of said blade and the inner peripheral wall of said chamber and the inner end of said blade and theouter peripheral surface of said roller member, the outer end of said blade having the larger radius.

JAMES P. JOHNSON. 

